Really don't think there would be that much of a discrepancy, but when I think back to my first car, a 73 Vega that I paid $100.00 for, I will even take the lower number you threw out.
It used more oil than gas, maybe averaged 8 MPG, and had suicide doors, not the Lincoln style, just flew open when you went around corners, hence the suicide part, and of course when it rained, you got a free shower. The AM radio picked up zero stations, and the heater worked in the summer, and not at all in the winter.
Thinking I like my 100 more each time I get to use it for "truck stuff", or just driving to work each day, Hell, might even ask to be buried in it at the ocean, just drive out on the beach and let mother nature take me home.